Wide-area dynamic security region

Makarov, Yuri V.; Du, Pengwei; Lu, Shuai; Nguyen, Tony; Burns, J. W.; Gronquist, J.

doi:10.1109/naps.2009.5484095

Cited by 6 publications

(13 citation statements)

References 18 publications

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“…The significance is that a non-linear transformation is applied to the origi- The authors of [20] were able to obtain 0% FDs on the same dataset used in [15] by using the Multi-Step Lasso technique. [32] Instead, the wide area security region in higher dimensions is an extension to the nomograms to incorporate a number of critical parameters to monitor the system security in a wide area. According to [33], Figure 2-2 shows an example of an approximated security region as a polyhedron where D 0 is the base operating point,H i is the hyperplane i, and ξ i is the stress vector.…”

Section: Functional Representation Of Stability Boundarymentioning

confidence: 99%

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Application of energy-based power system features for dynamic security assessment

Geeganage

Annakkage

Weekes

et al. 2015

2015 IEEE Power &Amp; Energy Society General Meeting

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To date, the potential of on-line Dynamic Security Assessment (DSA)-to monitor, alert, and enhance system security-is constrained by the longer computational cycle time. Traditional techniques requiring extensive numerical computations makes it challenging to complete the assessment within an acceptable time. Longer computational cycles produce obsolete security assessment results as the system operating point evolves continuously. This thesis presents a DSA algorithm, based on Transient Energy Function (TEF) method and machine learning, to enable frequent computational cycles in on-line DSA of power systems.The use of selected terms of the TEF as pre-processed input features for machine learning demonstrated the ability to successfully train a contingency-independent classifier that is capable of classifying stable and unstable operating points. The network is trained for current system topology and loading conditions. The classifier can be trained using a small dataset when the TEF terms are used as input features. The prediction accuracy of the proposed scheme was tested under the balanced and unbalanced faults with the presence of voltage sensitive and dynamic loads for different operating points. The test results demonstrate the potential of using the proposed technique for power system on-line DSA. Power system devices such as HVDC and FACTS can be included in the algorithm by incorporating the effective terms of a corresponding TEF.An on-line DSA system requires the integration of several functional components.Some of these components already exist and the others are newly introduced to the i power system. The practicality of the proposed technique in terms of a) critical data communications aspects b) computational hardware requirements; and c) capabilities and limitations of the tools in use was tested using an implementation of an on-line DSA system. The test power system model was simulated using a real-time digital simulator. The other functional units were distributed over the Local Area Network (LAN). The implementation indicated that an acceptable computational cycle time can be achieved using the proposed method.In addition, the work carried out during this thesis has produced two tools that can be used for a) web-based automated data generation for power system studies; and b) testing of on-line DSA algorithms.ii

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Section: Functional Representation Of Stability Boundarymentioning

confidence: 99%

“…The authors propose to construct the hyperplanes using off-line simulations reflecting thermal, voltage, voltage stability, small signal or transient stability constraints. Authors follow the approach proposed in [32] to define the following parameters. …”

Section: Using Hyperplanes and Nomogramsmentioning

confidence: 99%

Application of energy-based power system features for dynamic security assessment

Geeganage

Annakkage

Weekes

et al. 2015

2015 IEEE Power &Amp; Energy Society General Meeting

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“…Security region (SR) and security margin (SM) are important concepts helping to ensure reliable operation of a power system [1]. A SR is defined as a -dimensional set of nodal power injections (i.e., controllable generation and demand parameters) or voltage magnitudes and phase angles (i.e., state variables), for which the power flow equations and various security constraints are satisfied [2], [3].…”

Section: Previous Workmentioning

confidence: 99%

PMU-Based Wide-Area Security Assessment: Concept, Method, and Implementation

Makarov

et al. 2012

IEEE Trans. Smart Grid

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This paper presents a concept, method, and implementation of utilizing phasor measurement unit (PMU) information to monitor the wide-area security of a power system. The close dependency of major transmission paths requires an approach that takes that interaction into account while establishing operational transfer capability, and evaluates grid reliability and security on a system-wide basis. Thus, the concept of wide-area security region, which considers all essential constraints, including thermal, voltage stability, transient stability, and small signal stability, is proposed. This approach expands the idea of traditional transmission system nomograms to a multidimensional case, involving multiple system limits and parameters such as transmission path constraints, zonal generation or load, etc., considered concurrently. In this paper, the security region boundary is represented using piecewise approximation with the help of linear inequalities (so called hyperplanes) in a multidimensional space, consisting of system parameters that are critical for security analysis. The goal of this approximation is to find a minimum set of hyperplanes that describe the boundary with a given accuracy. Offline computer simulations are conducted to build the security region and the hyperplanes can be applied in real time with phasor information for on-line security assessment. Numerical simulations have been performed for the full size Western Electricity Coordinating Council (WECC) system model, which comprises 15 126 buses and 3034 generators. Simulation results demonstrated the feasibility and effectiveness of this approach, and proved that the proposed approach can significantly enhance the wide-area situation awareness for a bulk power system like WECC.Index Terms-Operating transfer capability, real time security assessment, security margin, wide-area dynamic security region.

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“…A new methodology for determining the security region for operation of transmission systems is described in [8]. The calculation of the boundaries is done offline and can be used to identify efficient controls and remedial actions.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Remedial Action Against Aperiodic Small Signal Rotor Angle Instability

Weckesser¹,

Jóhannsson²,

Østergaard³

2016

IEEE Trans. Power Syst.

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Abstract-This paper presents a method that in real-time determines remedial actions, which restore stable operation with respect to aperiodic small signal rotor angle stability (ASSRAS) when insecure or unstable operation has been detected. An ASSRAS assessment method is used to monitor the stability boundary for each generator in real-time. The ASSRAS boundary represents the condition when a generator reaches the maximum steady state active power injection. The proposed control method exploits analytically derived expressions for the ASSRAS boundary and other characteristic curves in the injection impedance plane to determine an active power redispatch among selected generators to restore stable and secure operation. Since the method is purely based on analytically derived expression, the computation of the remedial actions is fast and well suited for real-time operation. The method was tested on the IEEE 14-bus and the Nordic32 test systems where results show that the method can efficiently determine the required active power redispatch to avoid an imminent instability.

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Wide-area dynamic security region

Cited by 6 publications

References 18 publications

Application of energy-based power system features for dynamic security assessment

Application of energy-based power system features for dynamic security assessment

PMU-Based Wide-Area Security Assessment: Concept, Method, and Implementation

Real-Time Remedial Action Against Aperiodic Small Signal Rotor Angle Instability

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